Boîte non redimensionnable proprement

Bonjour,
je souhaite créer une boîte de dialogue contenant un QwebView dont la largeur s'ajustera aux dimensions de la boîte de dialogue.

Mon code ci-dessous ne marche pas : quand on redimensionne la boîte, une partie du QwebView disparaît.
Je suis preneur d'une méthode purement de programmation, mais je préfèrerais savoir comment faire avec Qt Designer.

Le code Python : dial_VisuHTML.py

Code:

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# -*- coding: utf-8 -*-
 
# Form implementation generated from reading ui file 'C:\Documents and Settings\Christophe\Mes documents\2,pyBaNaMa\DebuterAvecPythonEtPyQT\CodesProjets\04-Proj4_MiniEditHTML\05-TestWebKit\dial_VisuHTML.ui     '
#
# Created: Thu Aug 07 18:41:06 2008
#      by: PyQt4 UI code generator 4.4.2
#
# WARNING! All changes made in this file will be lost!
 
from PyQt4 import QtCore, QtGui
 
class Ui_dial_VisuHTML(object):
    def setupUi(self, dial_VisuHTML):
        dial_VisuHTML.setObjectName("dial_VisuHTML")
        dial_VisuHTML.resize(498,487)
        self.verticalLayoutWidget = QtGui.QWidget(dial_VisuHTML)
        self.verticalLayoutWidget.setGeometry(QtCore.QRect(9,9,481,461))
        self.verticalLayoutWidget.setObjectName("verticalLayoutWidget")
        self.verticalLayout = QtGui.QVBoxLayout(self.verticalLayoutWidget)
        self.verticalLayout.setSizeConstraint(QtGui.QLayout.SetNoConstraint)
        self.verticalLayout.setObjectName("verticalLayout")
        self.webView = QtWebKit.QWebView(self.verticalLayoutWidget)
        self.webView.setUrl(QtCore.QUrl("about:blank"))
        self.webView.setObjectName("webView")
        self.verticalLayout.addWidget(self.webView)
 
        self.retranslateUi(dial_VisuHTML)
        QtCore.QMetaObject.connectSlotsByName(dial_VisuHTML)
 
    def retranslateUi(self, dial_VisuHTML):
        dial_VisuHTML.setWindowTitle(QtGui.QApplication.translate("dial_VisuHTML", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
 
from PyQt4 import QtWebKit
 
if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    dial_VisuHTML = QtGui.QDialog()
    ui = Ui_dial_VisuHTML()
    ui.setupUi(dial_VisuHTML)
    dial_VisuHTML.show()
    sys.exit(app.exec_())

Le code ui pour Qt Designer : dial_VisuHTML.ui

Code:

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<ui version="4.0" >
 <class>dial_VisuHTML</class>
 <widget class="QDialog" name="dial_VisuHTML" >
  <property name="geometry" >
   <rect>
    <x>0</x>
    <y>0</y>
    <width>498</width>
    <height>487</height>
   </rect>
  </property>
  <property name="windowTitle" >
   <string>Dialog</string>
  </property>
  <widget class="QWidget" name="verticalLayoutWidget" >
   <property name="geometry" >
    <rect>
     <x>9</x>
     <y>9</y>
     <width>481</width>
     <height>461</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout" >
    <property name="spacing" >
     <number>5</number>
    </property>
    <property name="sizeConstraint" >
     <enum>QLayout::SetDefaultConstraint</enum>
    </property>
    <property name="margin" >
     <number>5</number>
    </property>
    <item>
     <widget class="QWebView" name="webView" >
      <property name="url" >
       <url>
        <string>about:blank</string>
       </url>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
 </widget>
 <customwidgets>
  <customwidget>
   <class>QWebView</class>
   <extends>QWidget</extends>
   <header>QtWebKit/QWebView</header>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>